Thomas & Betts 20D, 15D owner manual Troubleshooting

TROUBLESHOOTING

Problem	Things to Check
	1. Battery voltage under load below 10 volts. Charge batteries.
	2. Loose battery connections, open battery switch or blown DC fuse.
	Tighten connections or replace fuse.
	3. Tripped circuit breaker on front panel. Push-in to reset breaker.
No Inverter Output	4. Thermal condition, excessive loads or inadequate ventilation
	caused overheating. Allow to cool. Ventilate the compartment.
	5. Overloads or short circuit, check for excessive loads or shorted
	wiring. Disconnect loads.
	6. Check the position of the jumper in the Auxiliary Switch Port. Install
	jumper when operating unit without a remote.
	Confirm that your volt meter is a True RMS meter. Standard volt
Low Inverter	meters will not accurately read the waveform of the inverter and may
	read anywhere from 90 to 120 volts. If a True RMS meter is not
Output Voltage
	available, check the brightness of an incandescent light bulb - if it
	appears normal, the output voltage is properly regulated.
	1. Wiring - check both the AC and DC connections.
	2. AC input voltage - low voltage input will result in low DC output
Little or No Output	current. Expect reduced charger output from generators under 3,500
from Battery	watts.
Charger	3. Check power share setting if using a remote panel.
	4. Check the position of the jumper in the Auxiliary Switch Port if not
	using a remote panel.
	1. Microwave ovens will normally cook slower on inverter power
	because the modified sine wave output has a slightly low peak AC
Microwave Oven	voltage.
Cooking Slow	2. Cooking speed will be determined by battery voltage. Low voltage
	results in increased cooking time. Support the battery bank with an
	alternator or other charging source for quicker cooking.
	1. Digital clocks either employ an internal time base or derive their
	time base from the incoming AC waveform. The inverter frequency is
Slow or Fast	well regulated at 60 Hz. The clock either counts the number of peaks
	in the waveform or the number of times the waveform crosses zero
Digital Clock
	volts. The circuitry that counts the zero crossing events is more
	popular. The longer zero cross time of the inverter’s modified sine
	wave may cause double clocking, resulting in a faster clock.

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Part No. 90-0123-00 Libertycombi.p65 10/26/98